US10506622B1 - Traffic coexistence for collocated transceivers including bluetooth transceivers - Google Patents
Traffic coexistence for collocated transceivers including bluetooth transceivers Download PDFInfo
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- US10506622B1 US10506622B1 US16/144,870 US201816144870A US10506622B1 US 10506622 B1 US10506622 B1 US 10506622B1 US 201816144870 A US201816144870 A US 201816144870A US 10506622 B1 US10506622 B1 US 10506622B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- This disclosure generally relates to collocated transceivers, and more specifically, to implementation of coexistence of traffic associated with such collocated transceivers.
- transceivers configured to transmit data in accordance with various wireless communications protocols.
- transceivers may utilize Wi-Fi communications protocols, or may use Bluetooth communications protocols.
- multiple transceivers may be implemented within a single device, and may share other system resources, such as transmission media, and components associated with such transmission media such as antenna. Accordingly, multiple transceivers may share a single antenna.
- such transceivers remain limited in their ability to share such transmission medium resources efficiently and effectively.
- FIG. 1 illustrates an example of a system that includes collocated transceivers, configured in accordance with some embodiments.
- FIG. 2 illustrates an example of a device that includes collocated transceivers, configured in accordance with some embodiments.
- FIG. 3 illustrates an example of a first timing diagram, configured in accordance with some embodiments.
- FIG. 4 illustrates an example of a second timing diagram, configured in accordance with some embodiments.
- FIG. 5 illustrates flow chart of an example of a method for implementing coexistence of traffic for collocated transceivers in accordance with some embodiments.
- FIG. 6 illustrates flow chart of another example of a method for implementing coexistence of traffic for collocated transceivers in accordance with some embodiments.
- Various devices may include one or more transceivers that share transmission media.
- a single device may include a Bluetooth transceiver as well as a wireless local area network transceiver (WLAN) transceiver.
- WLAN wireless local area network transceiver
- Such transceivers may share, at least in part, a common wireless medium of a 2.4 GHz band.
- transceivers may also share hardware associated with such a transmission medium, such as an antenna.
- coexistence techniques may be implemented so that the different transceivers sharing the same transmission medium may both utilize the transmission medium without interfering with each other's communications.
- Some coexistence techniques utilize the transmission of CTS-to-Self frame or management frame with every period of a transmission. In such techniques, such a frame is sent with each duty cycle and occupies a large amount of the available transmission traffic and might not be entirely effective in protecting transmitted traffic.
- collocated devices may include different transceivers that share a transmission medium.
- embodiments disclosed herein utilize the generation and transmission of a medium access schedule, that may be a QuietIE based schedule, to facilitate coexistence between different transceivers that share a transmission medium by, for example utilizing the same transmission band. Accordingly, the activity of downstream devices and the first transceiver may be configured and synchronized based on transmission characteristics of the second transceiver, and this may be accomplished using a single initial beacon frame.
- FIG. 1 illustrates an example of a system that includes collocated transceivers, configured in accordance with some embodiments.
- devices disclosed herein may include multiple transmission devices, such as transceivers, that may share a transmission medium. Accordingly, devices as disclosed herein are configured to implement coexistence of such transceivers in an efficient manner that greatly reduces the amount of transmission overhead utilized to implement such coexistence and sharing of the transmission medium.
- system 100 includes collocated device 102 .
- collocated device 102 is a device that is configured to include multiple collocated transmission devices that may share a common transmission medium.
- collocated device 102 may include first transceiver 104 and second transceiver 106 .
- first transceiver 104 and second transceiver 106 each include a transmitter and a receiver.
- first transceiver 104 may include a first transmitter and receiver compatible with a first communications protocol
- second transceiver 106 may include a second transmitter and receiver compatible with a second communications protocol.
- Both first transceiver 104 and second transceiver 106 are configured to transmit and receive data via antenna 109 which is configured to transmit and receive wireless communications signals. Accordingly, collocated device 102 is configured such that network traffic associated with first transceiver 104 and second transceiver 106 shares the utilization of antenna 109 .
- first transceiver 104 may include a processing device, such as processing device 108 , that is configured to schedule network traffic to implement coexistence of data traffic for first transceiver 104 and second transceiver 106 . More specifically, processing device 108 may be configured to determine and generate a schedule utilized send traffic associated with first transceiver 104 . Such a schedule may be determined and generated based on a protocol utilized by second transceiver 106 , and the schedule may be implemented utilizing a QuietIE parameter of a transmitted frame.
- processing device 108 may be configured to determine and generate a schedule utilized send traffic associated with first transceiver 104 . Such a schedule may be determined and generated based on a protocol utilized by second transceiver 106 , and the schedule may be implemented utilizing a QuietIE parameter of a transmitted frame.
- coexistence may be implemented by generating a QuietIE schedule that is transmitted in a beacon frame, and is synchronized to periodic activity of second transceiver 106 . Additional details of the scheduling of such traffic are discussed in greater detail below with reference to FIG. 2 .
- first transceiver 104 may be a WLAN device
- second transceiver 106 may be a Bluetooth device.
- collocated device 102 includes a WLAN transceiver and a Bluetooth transceiver that share a particular transmission medium that utilizes shared hardware components, such as antenna 109 .
- the schedule generated by processing device 108 for the WLAN transceiver is determined based, at least in part, on the Bluetooth protocol utilized by the Bluetooth transceiver. While various embodiments disclosed herein describe second transceiver 106 as being compatible with a Bluetooth protocol, it will be appreciated that other implementations of second transceiver 106 are contemplated and disclosed herein.
- second transceiver 106 may be compatible with other protocols such as Bluetooth Low Energy (BLE) or cellular protocols such as a Global System for Mobile Communications (GSM) protocol.
- BLE Bluetooth Low Energy
- GSM Global System for Mobile Communications
- collocated device 102 is configured as a software enabled access point (SoftAP). Accordingly, in some embodiments, collocated device 102 is configured to function as a wireless access point that handles wireless communication and routing of network traffic with one or more other wireless devices, such as first plurality of devices 110 and second plurality of devices 120 discussed in greater detail below and also with reference to, for example, FIG. 3 . In some embodiments, collocated device 102 is configured as a client device, or a station (STA), as will also be discussed in greater detail below with reference to, for example, FIG. 4 .
- STA station
- system 100 includes first plurality of devices 110 which may be devices configured to transmit and receive wireless network traffic utilizing a transmission modality similar to that of first transceiver 104 .
- first transceiver 104 is a WLAN transceiver
- first plurality of devices 110 may be WLAN devices.
- first plurality of devices 110 may include devices such as mobile phones and mobile devices, laptops and computing devices, as well as any other suitable wireless-enabled device such as smart home devices. Accordingly, first plurality of devices 110 is configured to communicate with first transceiver 104 .
- System 100 also includes second plurality of devices 120 which may be devices configured to transmit and receive wireless network traffic utilizing a transmission modality similar to that of second transceiver 106 .
- second transceiver 106 is a Bluetooth transceiver
- second plurality of devices 120 may be Bluetooth devices.
- second plurality of devices 120 may also include devices such as mobile phones and mobile devices, as well as laptops and computing devices.
- second plurality of devices 120 may include various smart devices, such as wearable devices. Accordingly, second plurality of devices 120 is configured to communicate with second transceiver 106 .
- first transceiver 104 and second transceiver 106 may be located on a same chip. Accordingly, the transceivers may be implemented as integrated circuits on a same die or substrate. In some embodiments, first transceiver 104 and second transceiver 106 may be implemented on different dies or chips. Accordingly, first transceiver 104 and second transceiver 106 may be implemented in different in different integrated circuits or processing devices. Accordingly, while FIG. 1 illustrates one example, of how first transceiver 104 and second transceiver 106 may be implemented, it will be appreciated that collocated device 102 as well as first transceiver 104 and second transceiver 106 may be configured in any of the ways described above and disclosed herein.
- first transceiver 104 may be coupled to a first antenna
- second transceiver 106 may be coupled to a second antenna, and the access to and utilization of such antennas may be configured as disclosed herein. In this way, access to the transmission medium may be controlled despite the use of multiple antennas.
- FIG. 2 illustrates an example of a device that includes collocated transceivers, configured in accordance with some embodiments.
- devices disclosed herein may include multiple transmission devices, such as transceivers, that may share a transmission medium.
- a collocated device such as collocated device 102
- first transceiver 104 and second transceiver 106 may be different types of transceivers that utilize different transmission protocols.
- first transceiver 104 may be a WLAN transceiver that is configured to utilize a Wi-Fi transmission protocol in accordance with a suitable 802.11 specification.
- second transceiver 106 may be a Bluetooth transceiver that is configured to utilize Bluetooth transmission protocols.
- second transceiver 106 may be configured to have a specific protocol issuing particular requests, such as Bluetooth sync events or requests, at particular times as designated by the Bluetooth transmission protocol.
- processing device 108 may include a packet traffic arbiter configured to manage data packets associated with first transceiver 104 , and processing device 108 is configured to generate the schedule. More specifically, processing device 108 is configured to generate a QuietIE schedule based on a transmission parameter of second transceiver 106 .
- a transmission parameter may refer to particular feature or characteristic of a transmission protocol, such as a period, frequency, amplitude, duty cycle, sequence of data values, or any other suitable unique characteristic or identifier associated with the transmission protocol.
- processing device 108 may identify periods of activity of second transceiver 106 based on the transmission protocol of second transceiver 106 .
- second transceiver 106 is a Bluetooth transceiver that utilizes an enhanced synchronous connection-oriented (eSCO) Bluetooth protocol. Such a protocol may have specific times at which sync requests are made, and at which Bluetooth traffic begins and ends.
- processing device 108 is configured to query second transceiver 106 to determine when such traffic is expected.
- Processing device 108 is further configured to generate a QuietIE schedule based on the results of such a query.
- eSCO enhanced synchronous connection-oriented
- the generated QuietIE schedule may be generated based on an identification or estimation of times at which traffic of second transceiver 106 is expected and not expected, such as when there is Bluetooth traffic, and when there is no Bluetooth traffic.
- such parameters or properties may be queried, observed, or inferred.
- Bluetooth traffic may have a particular carrier frequency with a particular duty cycle within that frequency.
- processing device 108 may determine when second transceiver 106 is not active and when there is no Bluetooth traffic.
- the generated QuietIE schedule is configured based on an indication of when transmission is possible by first transceiver 104 , such as when second transceiver is not transmitting.
- the Quite IE schedule may be synced to particular features of second transceiver 106 , such as Bluetooth sync events.
- the generated QuietIE schedule may be generated based on times at which the transmission medium is available for first transceiver 104 , as identified based on the transmission parameter of second transceiver 106 .
- the QuietIE schedule may identify periods when the transmission medium is quiet and absent, or periods when it is available and present. Accordingly, an access point generating the Quite IE schedule may include the Quite IE schedule in a beacon frame that is transmitted to downstream client devices, and the QuietIE schedule may identify when the access point is quiet and when the access point is available. In various embodiments, such downstream client devices may also be referred to herein as stations. In this way, operation of first transceiver 104 as well as downstream devices in communication with first transceiver 104 are configured to implement traffic in accordance with quiet and available times that are determined based on the estimated Bluetooth traffic activity of second transceiver 106 .
- processing device 108 is configured to generate the first and second control signals in accordance with the generated QuietIE schedule. For example, during an enabled time in which there is no expected Bluetooth traffic, and traffic is allowed for first transceiver 104 , which may be a WLAN transceiver which appears as present when enabled, first control signal may enable coupling between antenna 109 and first transceiver 104 , and second control signal may disable coupling between antenna 109 and second transceiver 106 .
- first control signal may disable coupling between antenna 109 and first transceiver 104
- second control signal may enable coupling between antenna 109 and second transceiver 106 . Additional details regarding such signals will be discussed in greater detail below with reference to FIGS. 3 and 4 .
- collocated device 102 further includes RF switch 202 which is coupled to antenna 109 , and is configured to enable and disable coupling between the transceivers and antenna 109 .
- a first control signal may control coupling/decoupling between first transceiver 104 and antenna 109 .
- a second control signal may control coupling/decoupling between second transceiver 106 and antenna 109 .
- control signals are generated by processing device 108 .
- collocated device 102 further includes interface 204 which provides a direct communicative interface between first transceiver 104 and second transceiver 106 .
- collocated device 102 also includes processor 206 and memory 208 which are configured to handle one or more processing operations associated with first transceiver 104 , second transceiver 106 , interface 204 , and RF switch 202 , and store data such as state data and backup data.
- communications between components of collocated device 102 may be facilitated by bus 210 .
- FIG. 3 illustrates an example of a first timing diagram, implemented in accordance with some embodiments.
- various control signals may be generated by processing device 108 .
- control signals may be grant signals that are configured to grant or deny access of a transceiver to a shared transmission medium.
- first control signal 302 may be configured to grant or deny transmission medium access to first transceiver 104 based, at least in part, on the QuietIE schedule, and may be generated by processing device 108 .
- second control signal 304 may be configured to grant or deny transmission medium access to second transceiver 106 based, at least in part, on the QuietIE schedule, and may be provided from processing device 108 to second transceiver 106 .
- control signals may be utilized to enable and disable coupling between first transceiver 104 and antenna 109 .
- first control signal 302 may be utilized as a transmission medium grant signal for first transceiver 104 .
- second control signal 304 may be utilized to enable and disable coupling between second transceiver 106 and antenna 109 .
- second control signal 304 may be utilized as a transmission medium grant signal for second transceiver 106 .
- First timeline 306 illustrates an example of states associated with first transceiver 104 .
- first transceiver 104 may be absent or quiet.
- first transceiver 104 is granted access to the transmission medium, first transceiver 104 is present or available.
- First timeline 306 also illustrates the initial transmission of a beacon frame that includes the QuietIE schedule.
- the collocated device including first transceiver 104 and second transceiver 106 is configured as an access point that is managing the coexistence of first transceiver 104 and second transceiver 106 in the transmission medium.
- first timeline 306 the coexistence between first transceiver 104 and second transceiver 106 is implemented using a single beacon frame.
- second timeline 308 a downstream client device may implement the transmitted QuietIE schedule to synchronize its quiet and active times to the generated schedule. Accordingly, the downstream client device may be quiet when first transceiver 104 is not granted access to the transmission medium, and the downstream client device may be in active when first transceiver 104 is granted access to the transmission medium.
- FIG. 4 illustrates an example of a second timing diagram, implemented in accordance with some embodiments.
- control signals such as first control signal 302 and second control signal 304 may be generated by processing device 108 and utilized to enable and disable coupling between first transceiver 104 and antenna 109 as well as to enable and disable coupling between second transceiver 106 and antenna 109 .
- first timeline 306 illustrates an example of states associated with first transceiver 104
- second timeline 308 illustrates how a downstream client device may implement the transmitted QuietIE schedule to synchronize its quiet and active times to the generated schedule.
- FIG. 4 further illustrates how a request frame may be issued by the downstream device to initiate the generation of the QuietIE schedule.
- collocated device 102 may be a downstream device, such as a client device or station, that is managing the coexistence of first transceiver 104 and second transceiver 106 in the transmission medium. Accordingly, when configured in this way collocated device 102 may transmit a QuietIE request frame to an access point.
- the access point may generate a QuietIE response action which may include the generation of the QuietIE schedule as described above.
- the QuietIE schedule may then be distributed in a beacon frame to all downstream client devices.
- the generation of a QuietIE schedule may be responsive to a request from a client device when a client device is managing the coexistence of first transceiver 104 and second transceiver 106 in the transmission medium.
- FIG. 5 illustrates flow chart of an example of a method for implementing coexistence of traffic for collocated transceivers in accordance with some embodiments.
- the implementation of coexistence of traffic as disclosed herein may utilize the transmission of far fewer frames, and result in reduction of transmission overhead associated with such coexistence of traffic.
- method 500 may being with operation 502 during which a QuietIE request action may be issued.
- the QuietIE request may be generated by a downstream client device which may be a station.
- a downstream client device may, for example, be a WLAN device that is in communication with first transceiver 104 .
- Method 500 may proceed to operation 504 during which a QuietIE response action may be performed.
- the QuietIE response action may include the transmission of a QuietIE response frame.
- Method 500 may proceed to operation 506 during which a QuietIE schedule may be generated.
- the QuietIE schedule may be generated based on the transmission parameter of another collocated transceiver, such as second transceiver 106 .
- the QuietIE schedule may be generated based on one or more characteristics of the transmission protocol of second transceiver 106 .
- the QuietIE schedule may be generated for a collocated WLAN transceiver and downstream STAs, and such QuietIE schedule may be generated based, at least in part, on a Bluetooth protocol implemented by a collocated Bluetooth transceiver.
- Method 500 may proceed to operation 508 during which the QuietIE schedule may be transmitted.
- the QuietIE schedule may be included in a beacon frame that is transmitted to all downstream devices.
- the downstream devices may receive the QuietIE schedule, and synchronize their quiet and active times based on the expected activity of second transceiver 106 .
- the transmission and implementation of the QuietIE schedule enables the implementation of coexistence of the collocated transceivers utilizing the single beacon frame, and request frame if utilized, as opposed to a CTS-to-Self frame or management frame with every transmission.
- Method 500 may proceed to operation 510 during which one or more control signals may be generated.
- control signals such as the first and second control signals may be generated and implemented based on the identified times underlying the QuietIE schedule. Accordingly, the first and second control signals may be generated and implemented to enable utilization of the transmission medium and associated hardware that may include, for example, antenna 109 , in a manner that in consistent with the generated QuietIE schedule.
- FIG. 6 illustrates flow chart of another example of a method for implementing coexistence of traffic for collocated transceivers in accordance with some embodiments.
- the implementation of coexistence of traffic as disclosed herein may utilize the transmission of far fewer frames, and may also implement legacy techniques when the implementation of a QuietIE schedule is not feasible.
- method 600 may being with operation 602 during which it may be determined if a QuietIE schedule is available. Such a determination may be made based on whether or not a QuietIE schedule is stored in a memory of a collocated device, or based on one or more indicators or identifiers that are configured to identify the availability of a QuietIE schedule. In various embodiments, if a QuietIE schedule is available, method 600 may proceed to operation 604 .
- a transceiver such as a second transceiver, may be aligned with the QuietIE schedule.
- a determination may be made based on a comparison of the QuietIE schedule with parameters or characteristics of the transmission protocol of the second transceiver. For example, available periods and quiet periods may be compared against parameters, such as duty cycle and period, of the transmission protocol of the second transceiver, and it may be determined if it is possible to align the second transceiver with the available periods and quiet periods given those parameters or characteristics.
- method 600 may proceed to operation 606 during which the second transceiver may be granted access to the transmission medium based on requests issued by the second transceiver and based on the transmission protocol of the second transceiver.
- the second transceiver may be a Bluetooth transceiver, and may be granted access to the transmission medium based on Bluetooth transmission requests.
- method 600 may proceed to operation 608 during which it may be determined if the QuietIE schedule may be aligned with a period of the transmission protocol of the second transceiver. For example, it may be determined if the QuietIE schedule may be aligned with a period of the second transceiver utilizing a Bluetooth protocol. Such a determination may be made based on one or more features or characteristics of the QuietIE schedule, such as a period or frequency, and a period of the transmission protocol of the second transceiver. If it is determined that the QuietIE schedule may be aligned with a period of the transmission protocol of the second transceiver, method 600 may proceed to operation 610 .
- the QuietIE schedule may be adjusted and implemented based on requests issued by the second transceiver.
- the QuietIE schedule may be moved or adjusted based on requests issued by the second transceiver, which may be Bluetooth requests. In this way, adjustments may be made to the implementation of the QuietIE schedule to align the QuietIE schedule with such Bluetooth requests.
- the second transceiver may be granted access to the transmission medium in accordance with such requests.
- method 600 may proceed to operation 614 during which the second transceiver may be switched to a legacy coexistence technique.
- the second transceiver may use CTS-to-Self frames or management frames to implement such coexistence, and such frames may be included with every transmission.
- method 600 may proceed to operation 616 during which new QuietIE schedule may be generated.
- this may include the generation of a QuietIE schedule request and/or the generation and distribution of a QuietIE schedule.
- the QuietIE schedule may be generated based, at least in part, on features or characteristics of a transmission protocol of the second transceiver, such as a timing of requests issued in accordance with the transmission protocol of the second transceiver, such as Bluetooth requests.
- method 600 may proceed to operation 606 during which the second transceiver may be granted access to the transmission medium based on requests issued by the second transceiver and based on the transmission protocol of the second transceiver. If a QuietIE schedule is not successfully generated, as determined in operation 618 , method 600 may proceed to operation 614 during which the second transceiver may be switched to a legacy coexistence technique.
- method 600 may proceed to operation 616 as discussed above, and it may be determined if a QuietIE schedule may be generated.
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Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16/144,870 US10506622B1 (en) | 2018-06-27 | 2018-09-27 | Traffic coexistence for collocated transceivers including bluetooth transceivers |
| CN201980040582.7A CN112335314B (en) | 2018-06-27 | 2019-05-08 | Method, device and system for realizing flow coexistence of collocated transceivers |
| DE112019003241.0T DE112019003241T9 (en) | 2018-06-27 | 2019-05-08 | TRAFFIC COEXISTENCE FOR LOCAL COMBINED TRANSCEIVERS INCLUDING BLUETOOTH TRANSCEIVERS |
| PCT/US2019/031376 WO2020005397A1 (en) | 2018-06-27 | 2019-05-08 | Traffic coexistence for collocated transceivers including bluetooth transceivers |
| US16/675,748 US11039457B2 (en) | 2018-06-27 | 2019-11-06 | Traffic coexistence for collocated transceivers including bluetooth transceivers |
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| US201862690714P | 2018-06-27 | 2018-06-27 | |
| US16/144,870 US10506622B1 (en) | 2018-06-27 | 2018-09-27 | Traffic coexistence for collocated transceivers including bluetooth transceivers |
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| US16/675,748 Continuation US11039457B2 (en) | 2018-06-27 | 2019-11-06 | Traffic coexistence for collocated transceivers including bluetooth transceivers |
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- 2019-05-08 CN CN201980040582.7A patent/CN112335314B/en active Active
- 2019-05-08 DE DE112019003241.0T patent/DE112019003241T9/en not_active Ceased
- 2019-11-06 US US16/675,748 patent/US11039457B2/en active Active
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Also Published As
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|---|---|
| DE112019003241T5 (en) | 2021-03-18 |
| WO2020005397A1 (en) | 2020-01-02 |
| US11039457B2 (en) | 2021-06-15 |
| US20200008213A1 (en) | 2020-01-02 |
| DE112019003241T9 (en) | 2021-05-20 |
| US20200100266A1 (en) | 2020-03-26 |
| CN112335314A (en) | 2021-02-05 |
| CN112335314B (en) | 2022-02-08 |
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